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Nat Commun. 2011 Sep 20;2:481. doi: 10.1038/ncomms1490.

A bimetallic nanoantenna for directional colour routing.

Author information

  • 1Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden. timurs@chalmers.se

Abstract

Recent progress in nanophotonics includes demonstrations of meta-materials displaying negative refraction at optical frequencies, directional single photon sources, plasmonic analogies of electromagnetically induced transparency and spectacular Fano resonances. The physics behind these intriguing effects is to a large extent governed by the same single parameter-optical phase. Here we describe a nanophotonic structure built from pairs of closely spaced gold and silver disks that show phase accumulation through material-dependent plasmon resonances. The bimetallic dimers show exotic optical properties, in particular scattering of red and blue light in opposite directions, in spite of being as compact as ∼λ(3)/100. These spectral and spatial photon-sorting nanodevices can be fabricated on a wafer scale and offer a versatile platform for manipulating optical response through polarization, choice of materials and geometrical parameters, thereby opening possibilities for a wide range of practical applications.

PMID:
21934665
[PubMed]
PMCID:
PMC3195252
Free PMC Article

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